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• W2024860183 startingPage "425" @default.
• W2024860183 abstract "The response to tetanus toxoid (TT) was studied in immune donors that carry two alleles of DR5 that differ only at DRβ residue 86: DRB1*1101 (G86, abbreviated 1101) and DRB1*1104 (V86, abbreviated 1104). A large number of TT-specific T cell clones was isolated and the epitopes recognized in association with 1101 and 1104 were mapped. We found that two epitopes (p2 and p32) can be recognized in association with both 1101 and 1104 while three epitopes (p23, p27 and p30) are recognized in association with 1101, but never in association with 1104. The sets of naturally processed self peptides displayed by 1101 and 1104 were characterized using alloreactive T cell clones. We found that all 1104 alloreactive clones recognize both 1104 and 1101, while ˜30% of the alloreactive 1101 clones fail to recognize 1104. Thus it is apparent that both naturally processed TTand self peptides displayed on 1104 molecules represent a fraction of those displayed on 1101 molecules. The mechanism responsible for this differential presentation was investigated by comparing the capacity of 1101 and 1104 antigen-presenting cells to present TTor synthetic peptides to specific T cells and by measuring the binding of these peptides to DR molecules. Three sets of results suggest that V86 acts as a constraint to the binding of naturally processed peptides: (i) all 1104-restricted or alloreactive T cell clones recognize TT- or allo-epitopes presented by 1101 as well, thus ruling out a major effect of V86 as a residue determining T cell restriction specificity; (ii) presentation of naturally processed peptides correlates in general with the capacity of long synthetic peptides to bind to 1101 or 1104 and (iii) while the naturally processed p30 epitope discriminates between 1101 and 1104, a short synthetic peptide binds equally well to and is comparably recognized in association with both 1101 and 1104. Taken together these results suggest that the natural polymorphism at residue 86 might be a molecular switch that finely tunes the complexity of the peptide collection presented on DR molecules." @default.
• W2024860183 created "2016-06-24" @default.
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• W2024860183 date "1993-02-01" @default.
• W2024860183 modified "2023-09-25" @default.
• W2024860183 title "The set of naturally processed peptides displayed by DR molecules is tuned by polymorphism of residue 86" @default.
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• W2024860183 doi "https://doi.org/10.1002/eji.1830230219" @default.
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